Dr. Raymond, obsessed with the unseen world, performs a risky brain operation on a young woman, Mary, hoping to grant her a glimpse of the primal god Pan. The surgery backfires, leaving Mary broken. Years later, a series of strange deaths and disturbing encounters surround Helen Vaughan, a captivating but unsettling woman. Men fall under her spell, only to meet tragic ends. The truth emerges - Helen is the monstrous offspring of Mary's encounter with Pan, a being of pure evil disguised as a beautiful woman. Through a tense confrontation, Helen is forced to take her own life, revealing a horrifying transformation that hints at the lurking darkness beyond our reality.